Method of separation

Patent metadata

Field	Value
Publication number	US-9950273-B2
Application number	US-201213821658-A
Country	US
Kind code	B2
Filing date	Mar 30, 2012
Priority date	Jan 25, 2012
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

The present invention provides a separation method of separating (A) and (B), comprising: a step of separating at least either an active hydrogen-containing compound (A) or a compound (B) that reversibly reacts with (A) from a mixture containing (A) and (B) by distillation in a multistage distillation column; and a step of supplying the mixture to an inactive region formed within the multistage distillation column.

First claim

The invention claimed is:

1. A method of separating an active hydrogen-containing compound (A) and a compound (B) that reversibly reacts with (A), comprising:
a step of separating at least either (A) or (B) from a mixture containing (A) and (B) by distillation in a multistage distillation column; and
a step of supplying the mixture to an inactive region formed within the multistage distillation column,

wherein:
the multistage distillation column is a plate column or a packed column; and
the inactive region is one plate in the plate column which a surface contacting with the mixture comprises a material inactive to a reaction between (A) and (B), or the inactive region is one theoretical plate in a packed column packed with a packing material comprising a material inactive to a reaction between (A) and (B),

wherein:
(i) the material inactive to a reaction between (A) and (B) is a material in which an Fe atom content, a Ni atom content and a Ti atom content are each 10 mass % or less; or
(ii) an area (X) (unit:m 2 ) of an inner surface of the inactive region contacting with the mixture and a volume (Y) (unit:m 3 ) of the mixture retained in the inactive region satisfy (X)/(Y)≤100,and
wherein:
the compound (A) contains a hydrogen atom bonded to a heteroatom or a halogen atom, and the compound (B) contains at least one group selected from the group consisting of formula (5), formula (6), formula(7) and formula (8):

—N═C═Y 4   (8)

wherein:
Y 1 , Y 2 , Y 3 and Y 4 each represents an oxygen atom,
R 1 and R 2 each independently represents an organic group having 1 to 30 carbon atoms, and
R″ represents an organic group.

2. The method according to claim 1 , wherein compound (A) contains at least one group selected from the group consisting of formula (1), formula (2), formula (3) and formula (4):
—NH 2   (1)

—X 1 H  (2)

wherein:
X 1 , X 2 , X 3 and X 4 each independently represent an oxygen atom or a sulfur atom, and R′ represents an organic group.

3. The method according to claim 1 , wherein the step of distillation separation is performed in the presence of a compound (C) that has a normal boiling point between a normal boiling point of (A) and a normal boiling point of (B) and is chemically inactive to (A) and (B).

4. The method according to claim 1 , wherein the compound (A) is represented by the following formula (9):

wherein:
R 3 represents an organic group having 1 to 44 carbon atoms,
X 5 represents an oxygen atom or a sulfur atom, and
a represents an integer of 1 to 6.

5. The method according to claim 1 , wherein the formula (8) of compound (B) has the following formula (10):

wherein:
R 4 represents an organic group having 1 to 80 carbon atoms,
Y 5 represents an oxygen atom, and
b represents an integer of 1 to 10.

Assignees

• Shinohata Masaaki
• Miyake Nobuhisa
• Asahi Kasei Chemicals Corp

Inventors

• Shinohata Masaaki
• Miyake Nobuhisa

Classifications

• C07C2601/14

  The ring being saturated · CPC title

• C07C271/12

  to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals · CPC title

• C07C265/14

  containing at least two isocyanate groups bound to the same carbon skeleton · CPC title

• B01D3/009 Primary

  in combination with chemical reactions · CPC title

• C07C271/44

  to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals · CPC title